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NAME
     alarm - execute a subroutine after a specified time

SYNOPSIS
     integer*4 function alarm (time, sbrtn)
     integer*4 time
     external sbrtn

USAGE
     integer*4 time /8/
     external sbrtn
     nseconds = alarm(time,sbrtn)

DESCRIPTION
     This routine arranges for  subroutine  sbrtn  to  be  called
     after  time seconds.  If time is 0, the alarm is turned off,
     and no routine is called.  The returned value  is  the  time
     remaining on the last alarm.

RESTRICTIONS
     A subroutine cannot pass its own name to alarm.

     The alarm routine generates  signals  that  could  interfere
     with any I/O. The called routine, sbrtn, must not do any I/O
     itself.

     Calling alarm() from a parallelized or  multi-threaded  pro-
     gram may have unpredictable results.

FILES
     libF77.a

SEE ALSO
     alarm(2), sleep(3F), signal(3F)

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